I like the main figure a lot (nice halation). The background doesn't seem to belong to him, though. You get away with it because the light ties it together, but those dead figures look much too small and the perspective doesn't make sense with his posture.

I dont know if it was your intent, but the expression of the man is incredibly B-movie (parody of expression, ie a bad actor trying to look horrified and overdoing it)and makes it less horror and more dark comedy, for me.
But yeah the backround doesnt match it at all its isometric almost.

I like the piece and agree with everyone's comments so far, right now the expression doesn't look like he is freaked out enough, it just looks like bad acting. I do like how the figure is lit. I really like the bloody hands, those came out nicely. They look like weapons.